Parse wav

reader.on('end', function(){
    raw = Buffer.concat(raw) // concat all buffers into one
    data = [] // this will hold the processed data
    for (var i=0; i < raw.length; i += format.blockAlign){
        str = ""
        // Note that here I am taking only the first channel
        for(var j=0; j<format.blockAlign/format.channels; j++)
            if(format.endianness == "LE") //decide how to combine using endianess
                str = raw[i+j].toString(16) + str
            else
                str += raw[i+j].toString(16)
            data.push(hexToInt(str))
    }
    /*
        Now do whatever you want with "data"
    */
});

// This function handles negative numbers as well
function hexToInt (hex) {
    if (hex.length % 2 != 0) {
        hex = "0" + hex;
    }
    var num = parseInt(hex, 16);
    var maxVal = Math.pow(2, hex.length / 2 * 8);
    if (num > maxVal / 2 - 1) {
        num = num - maxVal
    }
    return num;
}